As variants of Covid-19 have spread in the US, the public health policy and programmatic responses have been largely consistent: vaccinate as soon as possible, mask up and keep social distancing. But as vaccinations have increased, there has been a collective relaxation of the masking and distancing that were previously indispensable public health measures.
원문출처 : https://www.cnn.com/2021/06/10/opinions/covid-19-delta-variant-us-holtgrave/index.html
원문출처 : https://www.cnn.com/2021/06/10/opinions/covid-19-delta-variant-us-holtgrave/index.html